Centrifugal pump flow induction noise numerical prediction method

Abstract

The invention discloses a centrifugal pump flow induction noise numerical prediction method which is used for computing the sound source feature of flow noise on the basis of the test results of a centrifugal pump performance test. The method can well overcome the shortcomings that in a traditional computing method, the influence from a pump body structure on acoustic propagation is not considered, and eddy broadband noise is ignored. Centrifugal pump inner flow analysis and far-field noise value computing results are used in centrifugal pump low-noise waterpower design, test frequency can be reduced, the development cycle can be shortened, development cost can be saved, the design quality of a centrifugal pump can be effectively improved, an interpolation method is used between a fluid mesh and an acoustics mesh, sound source information of flow field calculation can be reserved to the maximum degree, GREEN analysis is used, the contribution degree on noise from different parts of a shell body can be obtained, such study is carried out, and early design or later modifying of the shell body can be optimized.

Description

technical field [0001] The invention relates to a numerical prediction method of flow-induced noise of a centrifugal rotating machine, in particular to a numerical prediction method of hydraulic noise caused by a flow phenomenon in a centrifugal pump. Background technique [0002] In recent years, noise pollution has become one of the world's three major pollutions alongside air pollution and water pollution, affecting people's physical and mental states. The noise emitted by general mechanical devices has become a public nuisance and has attracted the attention of the society. Many countries have formulated many laws and standards, and proposed the limit allowable value of vibration and noise. Noise reduction has become an important factor restricting product quality. [0003] As an important energy conversion device and fluid conveying equipment, centrifugal pumps are widely used in various sectors of the national economy, and their noise has become one of the main noise ...

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Problems solved by technology

[0005] Technical problem to be solved by the present invention: Aiming at the problems existing in the prior art, the present invention provides a numerical prediction of the flow-induced noise of the centrifugal pump by calculating the sound source characteristics of the flow noise on the basis of the experimental results of the performance test of the centrifugal pump method, and this method can better overcome the shortcomings of traditional calculation methods that do not consider the influence of pump body structure on sound propagation and ignore eddy current broadband noise.

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